Overview of the Position Editor

The position editor provides a graphical view of the observation and
can interactively modify elements of it. The position editor is launched by clicking the Images
button on the main toolbar or the Images... button in any target component. It has
four constituent parts, identified in the image below:

Toolbar - open stored images; navigate through previously-viewed images
(also in the menu bar, see a description of the Go
menu
for history navigation info), change the display stretch, access the
catalog viewer, and search for guidestars and download images.
See a detailed description of the toolbar buttons.

Position editor buttons - display or move the base position or
instrument angle; display, add, move or delete WFS star or offset positions; display the
WFS and science instrument fields of view and mosaic patterns; display guide star
and on-line catalogue sources. See a detailed description of the position editor buttons.

Position editor viewer - display an (optional) image of the field
around the science target and overlay instrument, WFS and catalogue information. Any FITS
image that contains a suitable world coordinate system may be used as the background image
(see more details about the viewer). The viewer image (with or
without overlays) can be printed or saved to disk (from the file and catalog items on the
menu bar).